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Mater Sci Nanotechnol 2017 | Volume 1 Issue 2
allied
academies
Nanomaterials and Nanochemistry
November 29-30, 2017 | Atlanta, USA
International Conference on
High-performance rechargeable batteries are urgently
required to meet the rapidly increasing demand for energy
storage with cost and availability merits. Recently, sodium-ion
batteries (SIBs) have emerged as a potential candidate owing
to the need for energy storage in large-scale applications such
as stationary grid storage. Sodium possesses the advantages of
natural abundances, relatively low cost and due tomonovalent;
its intercalation chemistry into electrode materials resembles
lithium. However, the development of cathode materials in SIBs
is quite challenging to compete for the lithium-ion batteries
(LIBs) as reduction potential of sodium is lower than lithium
(-2.71V compared to -3.04V vs. S.H.E.). Herein, we investigate
the electrochemical properties of a nanocomposite of
FeF3•0.5H2Oandreducedgrapheneoxideasacathodematerial
for SIBs. Two different cathodes comprising reduced graphene
oxide (RGO) and a composite (of RGO and FeF3•0.5H2O)
are characterized for SIBs. The RGO electrode delivers an
exceptionally stable discharge capacity of 240 mAh g−1 with a
stable long cycling up to 1000 cycles. The composite’s structure,
morphology, and microstructure were studied using XRD, SEM,
and TEM, respectively. The nanocomposite cathode exhibits a
high capacity of 266 mAh g−1 in SIBs. The composite also shows
a stable cycle performance with a high capacity retention of
>86% after 100 cycles. To understand the electrochemical
reaction mechanism in the composite electrode, the cells were
disassembled at different charged-discharged potentials for ex
situ TEM and X-ray absorption spectroscopy and the results
confirm the reversibility of reaction.
Speaker Biography
Dr. Kyung Yoon Chung is head and principal researcher of the Center for Energy
Convergence Research at Korea Institute of Science and Technology (KIST). He got his
Ph.D in materials science in 2003 at Yonsei University, South Korea. Then he worked
as a Research Associate at Chemistry Department of Brookhaven National Lab., USA.
Since 2006, he is working for the KIST. His research focuses on the electrode materials
for the secondary batteries. Currently, he is more focusing on the electrode materials
for next generation batteries.
e:
Kyung Yoon Chung
Korea Institute of Science and Technology, Korea
High-capacity long-cycle life reduced graphene oxide and it’s composite with iron
fluoride as cathode materials for Na-ion batteries